OGDOAD Meaning of OGDOAD in English [ 'ɒgdəʊad ]■ noun rare a group or set of eight.OriginC17: via late L. from Gk ogdoas , ~- , from ogdoos 'eighth', from oktō 'eight'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004